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Primary lesions
| Term | Definition |
|---|---|
| Bulla | Blister |
| Cyst | Sac containing fluid pus |
| Macule | small, discolored spot or patch |
| Nodule | solid bump larger than 0.4 inches |
| Papule | Pimple |
| Pustule | Raised, inflamed pimple |
| Tumor | Abnormal cell mass |
| Vesicle | Small blister with clear fluid |
| Wheal | itchy, swollen lesion ( hives) |